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https://www.readbyqxmd.com/read/27936324/influence-of-thermal-treatments-on-evolution-of-conductive-paths-in-carbon-nanotubes-al2o3-hybrids-reinforced-epoxy-composites
#1
Benhui Fan, Delong He, Yu Liu, Jinbo Bai
The conductive path formed by carbon nanotube (CNT) in polymer matrix is one of the most attractive topics for developing multifunctional nanocomposites. In this study we studied the evolution of conductive paths and interactions in the interfacial regions in epoxy based composites reinforced by urchin-like hybrid of CNTs and alumina microparticles (μAl2O3). A homogeneous dispersion of CNTs in the epoxy matrix was achieved thanks to the core-shell structures of CNTs-μAl2O3 hybrids, resulting in interpenetrated epoxy's cross-linking network which strongly bonded with CNTs...
December 9, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27936284/utility-of-preclinical-drug-versus-food-choice-procedures-to-evaluate-candidate-medications-for-methamphetamine-use-disorder
#2
Matthew L Banks
Substance use disorders are diagnosed as a manifestation of inappropriate behavioral allocation toward abused drugs and away from other behaviors maintained by more adaptive nondrug reinforcers (e.g., money and social relationships). Substance use disorder treatment goals include not only decreasing drug-maintained behavior but also promoting behavioral reallocation toward these socially adaptive alternative reinforcers. Preclinical drug self-administration procedures that offer concurrent access to both drug and nondrug reinforcers provide a translationally relevant dependent measure of behavioral allocation that may be useful for candidate medication evaluation...
December 9, 2016: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/27936186/maternal-separation-impairs-cocaine-induced-behavioural-sensitization-in-adolescent-mice
#3
Irene Gracia-Rubio, Olga Valverde, Elena Martinez-Laorden, Maria Moscoso-Castro, M Victoria Milanés, M Luisa Laorden
Adverse early-life conditions induce persistent disturbances that give rise to negative emotional states. Therefore, early life stress confers increased vulnerability to substance use disorders, mainly during adolescence as the brain is still developing. In this study, we investigated the consequences of maternal separation, a model of maternal neglect, on the psychotropic effects of cocaine and the neuroplasticity of the dopaminergic system. Our results show that mice exposed to maternal separation displayed attenuated behavioural sensitization, while no changes were found in the rewarding effects of cocaine in the conditioned place preference paradigm and in the reinforcing effects of cocaine in the self-administration paradigm...
2016: PloS One
https://www.readbyqxmd.com/read/27935988/effects-of-a-community-based-healthy-lifestyle-intervention-program-co-help-among-adults-with-prediabetes-in-a-developing-country-a-quasi-experimental-study
#4
Norliza Ibrahim, Foong Ming Moy, Intan Attikah Nur Awalludin, Zainudin Mohd Ali, Ikram Shah Ismail
BACKGROUND: The prevalence of type 2 diabetes among Malaysian adults has increased by more than two folds over the past two decades. Strategies to collaborate with the existing community partners may become a promising channel for wide-scale dissemination of diabetes prevention in the country. The objectives of this study were to determine the effects of community-based lifestyle interventions delivered to adults with prediabetes and their health-related quality of life as compared to the usual care group...
2016: PloS One
https://www.readbyqxmd.com/read/27935984/a-biodegradable-polyethylenimine-based-vector-modified-by-trifunctional-peptide-r18-for-enhancing-gene-transfection-efficiency-in-vivo
#5
Jing Hu, Manman Zhu, Kehai Liu, Hua Fan, Wenfang Zhao, Yuan Mao, Yaguang Zhang
Lack of capacity to cross the nucleus membrane seems to be one of the main reasons for the lower transfection efficiency of gene vectors observed in vivo study than in vitro. To solve this problem, a new non-viral gene vector was designed. First, a degradable polyethylenimine (PEI) derivate was synthesized by crosslinking low-molecular-weight (LMW) PEI with N-octyl-N-quaternary chitosan (OTMCS), and then adopting a designed trifunctional peptide (RGDC-TAT-NLS) with good tumor targeting, cell uptake and nucleus transport capabilities to modify OTMCS-PEI...
2016: PloS One
https://www.readbyqxmd.com/read/27935731/two-bayesian-tests-of-the-glomosys-model
#6
Sarahanne M Field, Eric-Jan Wagenmakers, Ben R Newell, René Zeelenberg, Don van Ravenzwaaij
Priming is arguably one of the key phenomena in contemporary social psychology. Recent retractions and failed replication attempts have led to a division in the field between proponents and skeptics and have reinforced the importance of confirming certain priming effects through replication. In this study, we describe the results of 2 preregistered replication attempts of 1 experiment by Förster and Denzler (2012). In both experiments, participants first processed letters either globally or locally, then were tested using a typicality rating task...
December 2016: Journal of Experimental Psychology. General
https://www.readbyqxmd.com/read/27935662/antibacterial-activity-of-glass-ionomer-cement-modified-by-zinc-oxide-nanoparticles
#7
Patrícia Petromilli Nordi Sasso Garcia, Mariana Florian Bell Cardia, Renata Serignoli Francisconi, Lívia Nordi Dovigo, Denise Madalena Palomari Spolidório, Alessandra Nara de Souza Rastelli, Ana Carolina Botta
This study evaluated the antibacterial activity of zinc oxide nanoparticles incorporated into self-cured glass ionomer cement (GIC) and light-cured resin-reinforced GIC on Streptococcus mutans biofilm. The GICs, Fuji II (GC America) and Fuji II LC (GC America), were incorporated with nanoparticles at concentrations of 0%, 1%, and 2% by weight, and the biofilm maturation time was one and seven days. Circular specimens of each GIC type were prepared. The antibacterial activity was evaluated by determining the number of colony forming units of S...
December 9, 2016: Microscopy Research and Technique
https://www.readbyqxmd.com/read/27935655/highly-flexible-multifunctional-biopaper-comprising-chitosan-reinforced-by-ultralong-hydroxyapatite-nanowires
#8
Tuan-Wei Sun, Ying-Jie Zhu, Feng Chen
The highly flexible multifunctional biopaper comprising ultralong hydroxyapatite nanowires and chitosan (UHANWs/CS) with high weight fractions of ultralong hydroxyapatite nanowires (UHANWs) up to 100 wt.% is reported herein. The as-prepared UHANWs/CS composite biopaper has high flexibility and superior mechanical properties even when the weight fraction of UHANWs is as high as 90 wt.%. In contrast, the control samples consisting of hydroxyapatite nanorods and chitosan (HANRs/CS) with weight fractions of HANRs higher than 66...
December 9, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27935296/graphene-montmorillonite-composite-sponge-for-safe-and-effective-hemostasis
#9
Guofeng Li, Kecheng Quan, Yuping Liang, Tianyi Li, Qipeng Yuan, Lei Tao, Qian Xie, Xing Wang
Montmorillonite (MMT) is considered to be the most effective hemostat among natural phyllosilicates. However, there is a barrier against using MMT for the commercial hemostatics because the invaded MMT powders might cause thrombosis in vessel. Till now, it is still a challenge to manage the release of MMT and eliminate its side effect. Herein, we present a graphene-MMT composite sponge (GMCS), synthesized under a hydrothermal reaction, fixing MMT powders into the cross-linked graphene sheets. We demonstrate that only a few embedded MMT can evoke remarkable platelet stimulation at the sponge interface, while maintaining fast plasma absorbency of the innate sponge...
December 9, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27935269/from-adolescent-to-elder-rats-motivation-for-palatable-food-and-cannabinoids-receptors
#10
Octavio Amancio-Belmont, Antonio Romano-López, Alejandra Evelin Ruiz-Contreras, Mónica Méndez-Díaz, Oscar Prospéro-García
To analyze motivation, food self-administration and decision-making was evaluated in adolescent, adult and aged rats. Subjects were trained to press a lever (fixed ratio, FR1 and FR5) in an operant chamber, to obtain chocolate flavor pellets. We assessed the progressive ratio (PR), extinction and reinstatement of the behavior. To estimate decision-making for food, rats were trained in the conditioned place preference (CPP) paradigm: a) associating one compartment with lab chow (LCh) one day and the other compartment with rice krisspies (RK), the next day...
December 9, 2016: Developmental Neurobiology
https://www.readbyqxmd.com/read/27934149/rational-integration-of-inbuilt-aperture-with-mesoporous-framework-in-unusual-asymmetrical-yolk-shell-structures-for-energy-storage-and-conversion
#11
Ting Zhu, Liangliang Zhu, Jing Wang, Ghim Wei Ho
Despite the attractive benefits of hollow structures as electrodes for advanced energy storage-conversion capabilities, one prevailing shortcoming is their compromised structural integrity and volumetric energy density due to the introduction of an ultrathin shell with an excessively underutilized large hollow cavity. Herein, we report a facile and template-free synthetic route to realize unusual asymmetrical yolk-shell (AYs) structures composed of mixed-valence NiCo2O4 material. Explicitly, this work highlights the unusual off-central core, an AYs structure that encompasses a hemispherical hollow interior, and a mesoporous solid counterpart...
December 7, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27933978/strong-and-stiff-high-performance-cellulose-nanocrystal-poly-vinyl-alcohol-composite-fibers
#12
Won Jun Lee, Adam J Clancy, Eero Kontturi, Alexander Bismarck, Milo S P Shaffer
The mechanical properties of rodlike cellulose nanocrystals (CNCs) suggest great potential as bioderived reinforcement in (nano)composites. Poly(vinyl alcohol) (PVOH) is a useful industrial material and very compatible with CNC chemistry. High performance CNC/PVOH composite fibers were produced coaxial coagulation spinning, followed by hot-drawing. We showed that CNCs increase the alignment and crystallinity of PVOH, as well as providing direct reinforcement, leading to enhanced fiber strength and stiffness...
November 23, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27933856/enabling-design-of-advanced-elastomer-with-bioinspired-metal-oxygen-coordination
#13
Xuhui Zhang, Zhenghai Tang, Baochun Guo, Liqun Zhang
It poses a huge challenge to expand the application gallery of rubbers into advanced smart materials and achieve the reinforcement simultaneously. In the present work, inspired by the metal-ligand complexations of mussel byssus, ferric ion was introduced into an oxygen-abundant rubber network to create additional metal-oxygen coordination cross-links. Such complexation has been revealed to be highly efficient in enhancing the strength and toughness of the rubbers. Significantly, such complexation also enables the functionalization of the rubber into highly damping or excellent multishape memory materials...
November 30, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27933770/structural-conversions-of-synthetic-and-protein-bound-iron-sulfur-clusters
#14
R H Holm, Wayne Lo
Synthetic iron-sulfur clusters of general formulation [FemSqLl](z) with core atoms Fe and S and terminal ligands L constitute a family of molecular clusters with remarkably diverse geometrical and electronic structures. Several structure types are also found in proteins. The large majority of research on these clusters has involved elucidation of physical properties. Here, we direct attention to reactivity in the form of cluster conversions in which the FemSq cores of reactants are transformed to new structures, usually of different nuclearity, in overall reactions such as self-assembly and fragment condensation and dissociation...
November 23, 2016: Chemical Reviews
https://www.readbyqxmd.com/read/27933732/hypothesis-driven-physical-examination-curriculum
#15
Sharon Allen, Andrew Olson, Jeremiah Menk, James Nixon
BACKGROUND: Medical students traditionally learn physical examination skills as a rote list of manoeuvres. Alternatives like hypothesis-driven physical examination (HDPE) may promote students' understanding of the contribution of physical examination to diagnostic reasoning. We sought to determine whether first-year medical students can effectively learn to perform a physical examination using an HDPE approach, and then tailor the examination to specific clinical scenarios. Medical students traditionally learn physical examination skills as a rote list of manoeuvres CONTEXT: First-year medical students at the University of Minnesota were taught both traditional and HDPE approaches during a required 17-week clinical skills course in their first semester...
December 9, 2016: Clinical Teacher
https://www.readbyqxmd.com/read/27933422/dual-mobility-cups-in-revision-total-hip-arthroplasty
#16
Anthony Viste, Romain Desmarchelier, Michel-Henri Fessy
AIM: The purpose of our study was to evaluate the dislocation and aseptic loosening rates of a dual mobility construct in revision total hip arthroplasty (THA). METHODS: Three hundred thirty-four revision THAs performed between 2006 and 2011, using a dual mobility cup, were included in this retrospective study. The indications for revision were aseptic loosening (70%), infection (21%) and recurrent instability (9%). The minimum follow-up was five years (mean 7 ± 2 years, maximum 10 years)...
December 8, 2016: International Orthopaedics
https://www.readbyqxmd.com/read/27933322/silicone-disclosing-material-used-after-ceramic-surface-treatment-reduces-bond-strength
#17
Sara Fraga, Sara Cioccari Oliveira, Gabriel Kalil Rocha Pereira, Pieter Beekman, Marília Pivetta Rippe, Cornelis J Kleverlaan
PURPOSE: To evaluate the effect of a silicone disclosing procedure performed at different timepoints on the shear bond strength (SBS) of cements (self-adhesive composite cement, self-etch composite cement, resin-reinforced glass-ionomer cement) to different substrates (zirconia, lithium disilicate, bovine dentin). MATERIALS AND METHODS: The substrate/cement combinations were assigned to two groups (n = 15) according to the timepoint, at which the vinyl polyether silicone disclosing agent was applied: after (experimental groups, EXP) or before (control groups, CTRL) specific micromechanical treatments of the substrate surface...
December 8, 2016: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/27933166/sex-specific-ecophysiological-responses-to-environmental-fluctuations-of-free-ranging-hermann-s-tortoises-implication-for-conservation
#18
Adélaïde Sibeaux, Catherine Louise Michel, Xavier Bonnet, Sébastien Caron, Kévin Fournière, Stephane Gagno, Jean-Marie Ballouard
Physiological parameters provide indicators to evaluate how organisms respond to conservation actions. For example, individuals translocated during reinforcement programmes may not adapt to their novel host environment and may exhibit elevated chronic levels of stress hormones and/or decreasing body condition. Conversely, successful conservation actions should be associated with a lack of detrimental physiological perturbation. However, physiological references fluctuate over time and are influenced by various factors (e...
2016: Conservation Physiology
https://www.readbyqxmd.com/read/27932827/clustered-glass-fibre-reinforced-composite-root-post
#19
(no author information available yet)
No abstract text is available yet for this article.
December 9, 2016: British Dental Journal
https://www.readbyqxmd.com/read/27932436/multifactorial-pathological-hip-subluxation-in-neurofibromatosis-type-1-nf1-due-to-intra-articular-plexiform-neurofibroma-lumbar-radiculopathy-and-neurofibromatous-polyneuropathy
#20
Waqar Waheed, Diego F Diego F Lemos, Nelms Nathaniel Nelms, Rup Tandan
Neurofibromatosis type-1 (NF1) is a multisystem disorder with very rare descriptions of hip instability. We report a case of a 37-year-old man with known NF1 and childhood-onset of left foot drop, who developed persistent left hip pain following a minor trauma. Physical examination revealed left-sided mild foot drop, hip abductor weakness, bilateral sensory loss in feet and an antalgic gait. Work-up revealed anterolateral subluxation of the left femoral head along with left hip plexiform neurofibroma (PN), dysplastic and degenerative changes, neurofibromatous neuropathy and chronic left L5 radiculopathy...
December 8, 2016: BMJ Case Reports
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